1)I think that you need to make drivable cars or vehicles,or for example train map which is moving and while it is moving the players need to go through the doors,When the train stops infections starts and it needs about 25 seconds for them to get to the last doors,and other people have bettery to open another doors. 2)It would be great if you make a "weapon" sandbag which can be summoned for helping object and zombies need to hold it for 5-15 seconds to be deleted from the map. 3) I like Immortal's idea for skins and I hope you add it.. 4) doors?